"Gigantic creatures. Triple rows of teeth, six inch claws, and three horns. They can move on four legs or two, and have two winglike extensions--not functional wings, but poisonous stingers. Very fast."

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Sith hounds were oversized beasts that were bred to be both fearless and relentless where they were tasked with guarding the Sith tombs on Korriban. Their distinctive characteristics included sharp horns, long claws and savage teeth. Tuk'ata were unusually intelligent and were even able to communicate with one another through means unknown. It was claimed that originally the species were non-violent grazing animals before being corrupted by Sith alchemy experiments that awakened latent parts of their brain which transformed them into unnatural abominations. On occasion, random mutations produce some tuk'ata that were able to live for centuries and grew to immense proportions.[1]

Considering that many were sealed inside the tombs themselves, some believe that they were immortal or drew nourishment from the Force itself, the latter part of which is likely true. It is also possible that they survived by feeding on small vermin or other creatures that infested the tombs as decay and time created new openings in the stone walls.

They were fearless guardians and would kill anything that entered the tombs. While on Korriban, Exar Kun was forced to fight several hounds as a test. Revan managed to kill one and take a Sith holocron from its belly. There where also some tuk'ata in Tulak Hord's tomb, where the tuk'ata mother lived. By the time of the Cold War, the valley was flooding with new and more vicious races of tuk'ata and many Sith both students and Lords, including Lord Renning, were interested in their biology which made them force-sensitive. Darth Bane had to deal with them in the Valley of the Dark Lords on Korriban. Approximately a thousand years later, a Jedi strike team made up of Obi-Wan Kenobi, Siri Tachi, Soara Antana, Ry-Gaul, and their respective apprentices faced a pack of Tuk'ata when entering a tomb. Tol Skorr, the Dark Jediservant of CountDooku, would be injured by one that had grown to a monstrous size and would face it years later when he and Quinlan Vos attempted to raid a Sith tomb.

Another large tuk'ata was seen on Yavin 4 guarding a cave. It was confronted by the Solo children, Jacen, Jaina, and Anakin, along with Lowbacca, and Finn Galfridian. It was initially hostile, but retreated back into its cave after Jacen Solo helped heal it. When Luke Skywalker, Ben Skywalker, Jaina Solo, and Vestara Khai went to Korriban to search for the Lost Tribe of Sith they were attacked by a large group of tuk'ata, but before they could attack Vestara communicated with them through the Sith language and told them not to attack. In 138 ABYDarth Nihl used the Force to bend an attacking tuk'ata's will to his own, however it was shortly killed by Darth Talon.